haverland



Aug. 18, 1959 Filed April 12, 1957 F. J. HAVERLAND 2,899,831

MACHINE MECHANISM 2 SheetsSheet 1 INVENTOR.

FRANK HAVERLAND Aug. 18, 1959 F. J. HAVERLAND MACHINE MECHANISM 2Sheets-Sheet 2 Filed April 12, 1957 INVENTOR.

: AN K I- HAVERLA 0 N wfmn ATTQRNE Y5 United States Patent-O MACHINEMECHANISM Frank J. Haverland, Chicago, Ill.

Application April 12, 1957, Serial No. 652,630 2 Claims. (CI. 7463) Thepresent invention relates to a machine mechanism for converting rotarymotion of one element to rotary or linear motion of another element at arate varying from the motion of the one element.

An object of the present invention is to provide a machine mechanismwhich lends itself to the application of a variable motion drive forcein a control system such as the control system of a burner.

Another object of the present invention is to provide a machinemechanism 'Which lends itself to installation in any mechanical systemin which it is desired to have one element rotating at a predeterminedspeed and a second element moving at speeds faster and slower than thatof said one element with the total average speed. for both elementsbeing the same for any cycle.

A further object of the present invention is to provide amachinemechanism having positive action, one sturdy in construction and ofrelatively few parts, one economically feasible to manufacture andassemble, and one which is highly effective in action. v These and otherobjects and advantages of the present invention will be fully apparentfrom the following description when taken in connection with the annexeddrawings, in which:

Figure 1 is an isometric view of the machine mechanism of the presentinvention attached to a control drive mechanism as an example of the useof the machine mechanism according to the present invention;

Figure 2 is a sectional view, on an enlarged soale, taken on line 2-2 ofFigure 1;

Figure 3 is a sectional view taken on the line 33 of Figure 2;

Figure 4 is an isometric exploded view of the components of the presentinvention;

Figure 5 is a schematic view showing the machine mechanism in oneposition;

Figure 6 is a view similar to Figure 5, showing the machine mechanism ina second position; and

Figure 7 is an isometric fragmentary view of a modified form of theattachment of the arms to the driven shaft.

Referring in greater detail to the drawings in which like numeralsindicate like parts throughout the several views, the machine mechanismaccording to the present invention is attachable to the motor shaft of afurnace control motor and the control rods of a burner'control system.Specifically, the machine mechanism includes a rotatable drive shaft 10which is connected to a motor shaft 8 of a slow moving reversible typecontrol motor 11 by means of a set screw 9, and further includes a pairof arms 14 and which are drivingly connected to the drive shaft 1tland'which are adapted to be connected to the control rods- 12 and 13respectively, of a burner control system. As shown in Figure l, thecontrolfrods'12 and 13 are disposed substantially parallel to each otherand are reciprocal between on and off positions. The control rods 12 and13 are simultaneously shiftable in opposite directions with respect toeach other upon rotation of the drive shaft 10 through 180 degrees.

ice

This is a single example of one of the uses of the machine mechanism ofthe present invention although other uses are contemplated.

When so used, the control rods 12 and 13 are connected by their one endsto the outer ends of the arms 14 and 15, respectively, and have theirother ends connected to components of the burner system such as an airinlet control and a fuel feed control. In such a system, it is desiredto control the volume of air admitted into the system in such a way asto vary the volume with respect to the volume .of coal or other fueladmitted to the system. The control rods 12 and 13 reciprocatesimultaneously in opposite directions as the arms 14 and 15 move throughdegrees-of rotary motion, first in one direction and then in the otherdirection in response to suitable system controls not shown.

The arm 15 is connected to the drive shaft 10 for positive rotationtherewith at the same rate of speed as the rate of rotation of the driveshaft 10. The arm 14, constituting a driven element, is connected to thedrive shaft It) so that for each complete or partial revolution of thedrive shaft 10, it will travel for a fractional part of the revolutionof the drive shaft 10, first at a slower rate-and then at a faster ratethan the rate of the drive shaft 10 and for the remainder part of thecomplete or partial revolution of the drive shaft 10, the arm 14 willtravel at the same rate as the rate of the drive shaft 10.

The drive shaft 15 projects into one closed end of a hollow fixed casing16 having a base 17 or other means by which it is fixed to a supportingsurface. The portion of the drive shaft 10 adjacent one end extendsthrough the end of the casing 16 and is fixedly mounted upon a firstplate member 18 intermediate the ends of the latter. A second platemember 19 is arranged in parallel spaced relation with respect to thefirst plate member 18 and is fixedly secured thereto by means of bolts21, three in number, as shown in Figure 2.

Two of the bolts 21 extend through eye-formations 22 and 23 on the endsof the legs of an L-shaped saddle member 24, one leg of which forms aseat for a coil spring 25. The plate members 18 and 19 form an openframe and a hollow shaft 26 has one end fixedly secured to the outerface of the member 19 and is disposed concentrically with respect to thedrive shaft 10. The portion adjacent the free end of the shaft 26extends exteriorly of the casing 16 through the end of the latter remotefrom the housing 11 and carries thereon a collar to which is afiixed thearm 15, the collar being shown in dotted lines in Figure 4 anddesignated by the reference numeral 27. v

The arm 14 is carried by the free end portion of a driven shaft 28 whichhas a portion adjacent the end remote from the free end extendingthrough the same end of the casing 16 as the shaft 26, the driven shaft28 extending through the collar 27 and'the hollow shaft 26.

The end of the driven shaft 28 remote from its free end is fixedlysecured to one face of a perpendicularly project ing arm 29 whichcarries on its free end a shelf 31.

The coil spring 25 has one end bearing against the one leg of the saddlemember 24 and its other end bearing against the underside of the shelf31.

The eye-formations 22 and 23 on the ends of the legs of the saddlemember 24 form spacing elements for the plates 18 and 19 and a sleeve 32forms another spacing element for the ends of the plates 18 and 19remote from the saddle member 24. The sleeve 32 also serves as a spacingelement for a pair of levers 33 and 34 at one end of the latter, theassociated bolt 21 extending through holes provided in the plates 18 and19, through holes provided in the adjacent end portions of the levers 33and 34 and through the sleeve 32 to connect the levers 33 and 34 to theplates 18' and 19' for rocking movement about the sleeve 32 andassociated bolt 21 as an axis. A stub shaft 35 extends through thelevers 33 and 34 and through ahole provided in a camroller 36 for thesupport of the cam roller 36- between the levers 33 and 34. The freeends of levers 33 and 34 remote from the sleeve 32 bear against theupper face of the shelf 31 and the spring 25 biases the cam roller 36 ina direction away from the axis of the driven shaft 10 and hollow shaft26.

The inner wall of the casing 16 is cylindrical in shape and for aportion of its periphery, the casing is provided with a plurality ofspaced stud bolts 37 extending through the casing wall and having theirinner ends in the path of rolling movement of thecam roller 36-. Thestud'bolts 37' are individually shiftable into and out of the casing 16so as to form when extended into the casing 16 a cam track over whichthe cam roller moves with a camming movement.

Referring to Figures and 6, in Figure 5 the cam roller 36 is shown inthe position engaging only stud bolts 37 which are not extended into thecasing any appreciable distance so that in effect the cam roller 36 isin camming movement upon the inner wall of the casing 16. In Figure 6, asingle stud bolt 37' has been moved inwardly of the casing 16 so as toform a cam over which the cam roller 36 is moved to effect the movementof the cam roller 36 towards the axis of the drive shaft 10. Thismovement effects the shifting of the arm 29 on the driven shaft 28 andresults in the partial rotation of the driven shaft 28 with respect tothe hollow shaft 26 and therefore with respect to the drive shaft 10. Itwill. be seen that for a partial or complete revolution of the. driveshaft 10, the driven shaft 28 will. at first move slower than the driveshaft and then will move faster than the drive shaft 10 and for theremaining part of the partial or complete revolution of the drive shaft10, the driven shaft 28 will travel at the same rate of speed as thedrive shaft 10, this movement occurring during the period of rollingmovement of the cam roller 36 upon the portion of the inner wall of thecasing 16 which has no stud bolts 37 projecting theretbrough. Themachine mechanism illustrated in Figure 1 permits the movement of thearms 14 and through substantially 180 degrees of rotation so that thecontrol rods 12 and 13,. constituting means connecting the arms 14 and15,. respectively, to members to be driven move in alternatinglyreciprocatory movements with the control rod 12 first moving at a rateslower than the rod 13 and then at a rate faster than the rod 13 and forthe remaining part or fractional part of the revolution of the arms 14and 15 at the same rate of speed as the rod 13.

In Figure 7, a modified form of the attachment of the arms 14' and 15'to the driven shaft 28" and the hollow shaft 26 is shown in whicheccentrics 38 and 39 are used to connect the arms. 14 and 15',respectively, to the shafts 28" and 26'. This permits the completerotation of the shafts 26 and 28 in one or more complete revolutions andeffects the same alternatingly reciprocatory movement of the arms 14'and 15 as means for driving members to be driven.

Preferably, the casing 16 is provided with a closed end 41 and open endcovered by a. closure member 42 for purposes of assembly. Each of thestud bolts 37 has an associated locking set screw 43 for securing it inits adjusted position within the casing 16 in which the series of studbolts 37 form, one extended, a cam track for the roller 36.

As shown in Figure 2, the cam roller 36, moving from its full lineposition to the dotted line position in the direction of the arrow rollsalong the inner ends of the bolts 37 as. a cam track to effect theshifting movement of the cam'roller 36 and compress. the spring to slowthe rotational movement of the driven shaft 28 relative to the driveshaft 10 and thento speed up the rotation of the driven shaft 28 and tofinally, with the cam roller 36 in the dotted line position, effect therotation of the driven shaft 28 at the same rate of speed as the driveshaft 10. It is intended that the arms 14 and 14 and 15 and 15' may beomitted and suitable gears, eccentrics, levers, and the like may besubstituted for the arms to effect the variable motion of. one, elementwith respect to the other element, as above described.

What is claimed is:

1. A machine mechanism comprising a hollow fixed casing having closedends, a rotatable drive shaft having a portion adjacent one end thereofextending through one end of said casing, a rotatable driven shafthaving a portion adjacent one end thereof extending through the otherend of said casing, means connecting said portion of said drive shaft tosaid portionvof said driven shaft so that for each partial or completerevolutionof said drive shaft said driven shaft will travel a fractionalpart of said partial or complete revolution first ata slower rate andthen at a faster rate than said drive shaft and for the remainder partof said partial or complete revolution will travel at the same rate assaid drive shaft, said means comprisingv a cam track positioned withinsaid casing eccentrically with respect to said driven shaft; an. armarranged perpendicularly with respect to said one end of said drivenshaft, an eccentric connecting said arm to said one end of said drivenshaft, a cam member in engagement with said cam track and connected tosaid drive shaft end. portion for orbital camming movement along saidcam track responsive to rotary movement of said drive shaft, and meansconnecting, said cam member to said arm and operable to shift said armrelative to said drive shaft responsive to camming movement of said cammember.

2. A machine mechanism comprising a hollow fixed casing having closedends, a rotatable drive shaft having a portion adjacent one end thereofextending through one end of said casing, a rotatable driven shafthaving a portion adjacent one end thereof extending through the otherend of said casing, and means connecting said portion of said driveshaft to said portion of said driven shaft so that for each partial orcomplete revolution of said drive shaft said driven shaft will travel afractional part of said partial or complete revolution first at a slowerrate and then at a faster rate than said drive shaft'and for theremainder part of said partial or complete revolution will travel at thesame rate as said drive shaft, said means comprising a cam trackpositioned within said casing eccentrically with respect to said drivenshaft, an arm arranged perpendicularly with respect to said one end ofsaid driven shaft, an eccentric connecting said arm to said one end ofsaid driven shaft, a cam member in engagement with said cam track andconnected to said drive shaft end portion for orbital camming movementalong said cam track responsive to rotary movement of said drive shaft,means connecting said cam member to said arm and operable to shift saidarm relative to said drive shaft responsive to camming movement of saidcam member, and spring means operatively connected to said cam memberfor urging the latter into engagement with said cam track.

References Citedv in the file of this patent UNITED STATES PATENTS1,138,854 Edgecombe May 11,, 1915 1,595,028 Smith Aug. 3, 1926 2,322,031Kuebert. June 15, 1.943 2,514,420 Shapiro July 11, 1950 2,589,852Overacker Mar. 18, 1952 2,616,302 Wahlmark Nov. 4,, 1952 2,777,513Cooper Jan. 15 1957

